emit interfaces before use

lib/runtime/dart/_interceptors.js

 var _interceptors;
 (function(exports) {
   'use strict';
   class Interceptor extends core.Object {
     Interceptor() {
     }
     ['=='](other) {
       return core.identical(this, other);
     }
     get hashCode() {
       return _js_helper.Primitives.objectHashCode(this);
     }
     toString() {
       return _js_helper.Primitives.objectToString(this);
     }
     noSuchMethod(invocation) {
       throw new core.NoSuchMethodError(this, invocation.memberName, invocation.positionalArguments, invocation.namedArguments);
     }
     get runtimeType() {
       return _js_helper.getRuntimeType(this);
     }
   }
+  class JSIndexable extends core.Object {}
   let JSArray$ = dart.generic(function(E) {
     class JSArray extends Interceptor {
       JSArray() {
         super.Interceptor();
       }
       fixed(length) {
         if (dart.notNull(!(typeof length == 'number')) || dart.notNull(length) < 0) {
           throw new core.ArgumentError(`Length must be a non-negative integer: ${length}`);
         }
         return new JSArray.markFixed(new Array(length));
@@ skipping 315 matching lines @@
     JSArray[dart.implements] = [core.List$(E), JSIndexable];
     dart.defineNamedConstructor(JSArray, 'fixed');
     dart.defineNamedConstructor(JSArray, 'emptyGrowable');
     dart.defineNamedConstructor(JSArray, 'growable');
     dart.defineNamedConstructor(JSArray, 'typed');
     dart.defineNamedConstructor(JSArray, 'markFixed');
     dart.defineNamedConstructor(JSArray, 'markGrowable');
     return JSArray;
   });
   let JSArray = JSArray$(dart.dynamic);
+  class JSMutableIndexable extends JSIndexable {}
   let JSMutableArray$ = dart.generic(function(E) {
-    class JSMutableArray extends JSArray$(E) {
-    }
+    class JSMutableArray extends JSArray$(E) {}
     JSMutableArray[dart.implements] = [JSMutableIndexable];
     return JSMutableArray;
   });
   let JSMutableArray = JSMutableArray$(dart.dynamic);
   let JSFixedArray$ = dart.generic(function(E) {
-    class JSFixedArray extends JSMutableArray$(E) {
-    }
+    class JSFixedArray extends JSMutableArray$(E) {}
     return JSFixedArray;
   });
   let JSFixedArray = JSFixedArray$(dart.dynamic);
   let JSExtendableArray$ = dart.generic(function(E) {
-    class JSExtendableArray extends JSMutableArray$(E) {
-    }
+    class JSExtendableArray extends JSMutableArray$(E) {}
     return JSExtendableArray;
   });
   let JSExtendableArray = JSExtendableArray$(dart.dynamic);
   let _MIN_INT32 = Symbol('_MIN_INT32');
   let _MAX_INT32 = Symbol('_MAX_INT32');
   let _handleIEtoString = Symbol('_handleIEtoString');
   let _isInt32 = Symbol('_isInt32');
   let _tdivFast = Symbol('_tdivFast');
   let _tdivSlow = Symbol('_tdivSlow');
   let _shlPositive = Symbol('_shlPositive');
@@ skipping 373 matching lines @@
   JSInt[dart.implements] = [core.int, core.double];
   class JSDouble extends JSNumber {
     JSDouble() {
       super.JSNumber();
     }
     get runtimeType() {
       return core.double;
     }
   }
   JSDouble[dart.implements] = [core.double];
-  class JSPositiveInt extends JSInt {
-  }
-  class JSUInt32 extends JSPositiveInt {
-  }
-  class JSUInt31 extends JSUInt32 {
-  }
+  class JSPositiveInt extends JSInt {}
+  class JSUInt32 extends JSPositiveInt {}
+  class JSUInt31 extends JSUInt32 {}
   let _defaultSplit = Symbol('_defaultSplit');
   let _isWhitespace = Symbol('_isWhitespace');
   let _skipLeadingWhitespace = Symbol('_skipLeadingWhitespace');
   let _skipTrailingWhitespace = Symbol('_skipTrailingWhitespace');
   class JSString extends Interceptor {
     JSString() {
       super.Interceptor();
     }
     codeUnitAt(index) {
       if (!(typeof index == 'number'))
@@ skipping 575 matching lines @@
       return 0;
     }
     get runtimeType() {
       return core.Null;
     }
     noSuchMethod(invocation) {
       return super.noSuchMethod(invocation);
     }
   }
   JSNull[dart.implements] = [core.Null];
-  class JSIndexable extends core.Object {
-  }
-  class JSMutableIndexable extends JSIndexable {
-  }
-  class JSObject extends core.Object {
-  }
+  class JSObject extends core.Object {}
   class JavaScriptObject extends Interceptor {
     JavaScriptObject() {
       super.Interceptor();
     }
     get hashCode() {
       return 0;
     }
     get runtimeType() {
       return JSObject;
     }
   }
   JavaScriptObject[dart.implements] = [JSObject];
   class PlainJavaScriptObject extends JavaScriptObject {
     PlainJavaScriptObject() {
       super.JavaScriptObject();
     }
   }
   class UnknownJavaScriptObject extends JavaScriptObject {
     UnknownJavaScriptObject() {
       super.JavaScriptObject();
     }
     toString() {
       return String(this);
     }
   }
   // Exports:
   exports.JSArray = JSArray;
   exports.JSArray$ = JSArray$;
   exports.Interceptor = Interceptor;
+  exports.JSIndexable = JSIndexable;
   exports.JSMutableArray = JSMutableArray;
   exports.JSMutableArray$ = JSMutableArray$;
+  exports.JSMutableIndexable = JSMutableIndexable;
   exports.JSFixedArray = JSFixedArray;
   exports.JSFixedArray$ = JSFixedArray$;
   exports.JSExtendableArray = JSExtendableArray;
   exports.JSExtendableArray$ = JSExtendableArray$;
   exports.JSNumber = JSNumber;
   exports.JSInt = JSInt;
   exports.JSDouble = JSDouble;
   exports.JSPositiveInt = JSPositiveInt;
   exports.JSUInt32 = JSUInt32;
   exports.JSUInt31 = JSUInt31;
   exports.JSString = JSString;
   exports.getInterceptor = getInterceptor;
   exports.getDispatchProperty = getDispatchProperty;
   exports.setDispatchProperty = setDispatchProperty;
   exports.makeDispatchRecord = makeDispatchRecord;
   exports.dispatchRecordInterceptor = dispatchRecordInterceptor;
   exports.dispatchRecordProto = dispatchRecordProto;
   exports.dispatchRecordExtension = dispatchRecordExtension;
   exports.dispatchRecordIndexability = dispatchRecordIndexability;
   exports.getNativeInterceptor = getNativeInterceptor;
   exports.findIndexForNativeSubclassType = findIndexForNativeSubclassType;
   exports.findInterceptorConstructorForType = findInterceptorConstructorForType;
   exports.findConstructorForNativeSubclassType = findConstructorForNativeSubclassType;
   exports.findInterceptorForType = findInterceptorForType;
   exports.JSBool = JSBool;
   exports.JSNull = JSNull;
-  exports.JSIndexable = JSIndexable;
-  exports.JSMutableIndexable = JSMutableIndexable;
   exports.JSObject = JSObject;
   exports.JavaScriptObject = JavaScriptObject;
   exports.PlainJavaScriptObject = PlainJavaScriptObject;
   exports.UnknownJavaScriptObject = UnknownJavaScriptObject;
 })(_interceptors || (_interceptors = {}));